Good for slow notes, mostly

I tested this app on my iPad air. I used a common Yamaha portable keyboard for the test.

All the notes on the keyboard showed green (which means they are in tune according to the app), but the green pitch lines were obviously above the blue pitch lines provided by the app.

I played amazing Grace on the keyboard, and played some triplets between "amaz" ... "Grace", and the pitch graph could not keep up, even on a modern iPad air. Instead of rapid changes between notes in the triplet that should have produced near – vertical lines connecting horizontal green lines, I saw a bunch of sloped and curvedlines with red sections in them.

This means the app could not keep up with even a slow song like amazing Grace. I dont think it would be useful in anything faster.

kkkwj about Pitch Graph, v1.0.1